Abstract
Large single crystals of cuprous oxide, Cu 2O, have been grown by a floating zone technique using an arc-image furnace. The microstructure of the polycrystalline starting material obtained by oxidation of copper and of the single crystals grown from the melt have been investigated in detail, as well as the influence of atmosphere, solidification rate and impurity concentration. The precipitate structure inherent to the conditions of crystal growth was extremely complex, consisting of various forms of cupric oxide inclusions and aggregates of gas and cupric oxide. The microstructural changes accompanying high-temperature annealing within the cuprous oxide stability field are described. A procedure for crystal growth and treatment which minimizes the amount of defects is developed.
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